2004 f250 6.0 diesel bad fuel mileage! FICM producing right voltage, new wheel bearings, all filters always changed, I have an edge tuner and it does not matter fuel saver tow mode or off still only get 12.4 MPG? When I got this truck I was getting around 15-16MPG where has it gone? EGR connected or disconnected same mileage. K&N air filter or the stock one no change? The truck runs great no issues lots of power I can pull my trailer and bobcat with no issues over 10,000lbs for the hell of it I put in a new ICP and EGR feedback sensor (someone told me they might help) I don't even get better mileage on the highway without a load? I used to get 18-19MPG on the highway it has been like this for at least a year, I am getting fed up with it every time I go to the fuel pump! Does anyone have any suggestions? I cant seem to find the answer.

We still have warm weather here and not yet gone to winter fuel, I took on vacation not towing anything and still only got around 12.5MPG that was mid summer and it didn't matter what setting I had on the edge, I am not looking for power just some decent fuel mileage, My old gm diesel got 20-22 highway and 15-16 in town and that was a bigger truck! Don't get me wrong I like my ford way better! I am just hoping to get the mileage a little better, I even punched out the cat and the truck already had 5" exhaust on it.
I checked the break callipers multiple times I found that on a few threads but that is not my issue.

Your front brakes equate to 80% of your stopping power every time you apply the brakes. That's why fronts wear faster than backs.

One way of checking is to jack the truck up in the air and set it on jack stands put it in neutral and try spinning the wheels of thy feel like they are hanging up and not spinning freely than you have a caliper hanging up most likely.

l BRYAN l

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if you had an edge cts you could check icp, does it start up and run nice and smooth?

I don't remember if it was IDP or Gearheads, but one of them told me that some ICP readings are going to be higher than actual to get the computer to work with the custom tume. Although I don't remember if that was idle, cruise, or WFO.

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